This had mixed results, but trying sharp angles angles (sharper than above) and long exposure times generally worked. We played a little with different sides of the chip. In all tests main EPROM was untouched.

Not perfect, but should be good enough for the real chip. Masking:

And tried a few angles until the security fuse got cleared. Yipee!

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Monday, May 1, 2017

A bit back we processed PIC16C57 samples and discovered#139 (Invasion U76) was partially defective as received. We knew this before decap since PIC16C57 allows reading a 4 bit XOR of the 12 bit flash worlds even when protected. Unfortunately, only 2/4 word bits changed in the protected readout and only 3/12 word bits changed in the unprotected version.

Like Invasion, Mortal Kombat 4 is built on the Midway Zeus platform. With this in mind, a team member donated U76 from Mortal Kombat 4 to process as a replacement. Label off: